/* ============================================================
   GIAO DIEN DUNG CHUNG CHO CAC TRANG PHU
   (trang san pham, so sanh, huong dan cai dat, cam on)
   FILE NAY DUNG SUA TAY neu khong biet CSS.
   ============================================================ */
:root{
  --bg:#0d1117; --bg2:#151b23; --card:#161d27; --card2:#1c2532;
  --line:#263141; --txt:#e6edf3; --dim:#8b98a9;
  --acc:#3fb950; --acc2:#2ea043;
  --gold:#f0b429; --gold2:#d99a15;
  --blue:#58a6ff; --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Segoe UI',system-ui,-apple-system,Roboto,Arial,sans-serif;
  color:var(--txt);line-height:1.6;-webkit-font-smoothing:antialiased;
  background:
    linear-gradient(rgba(88,166,255,.035) 1px,transparent 1px) 0 0/46px 46px,
    linear-gradient(90deg,rgba(88,166,255,.035) 1px,transparent 1px) 0 0/46px 46px,
    var(--bg);
  min-height:100vh;
}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}

/* ---------- DAU TRANG ---------- */
header{
  background:rgba(13,17,23,.9);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;
}
.hd{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 20px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:900;color:var(--txt)}
.logo:hover{text-decoration:none}
.logo .mark{
  width:32px;height:32px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--acc),var(--gold));font-size:17px;
}
.hd nav{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.hd nav a{
  color:var(--dim);font-size:14px;font-weight:700;padding:7px 12px;border-radius:9px;
}
.hd nav a:hover{color:var(--txt);background:rgba(255,255,255,.06);text-decoration:none}
.hd nav a.zl{background:linear-gradient(135deg,#0068ff,#0053cc);color:#fff}

/* ---------- DUONG DAN ---------- */
.crumb{font-size:13.5px;color:var(--dim);padding:18px 0 6px}
.crumb a{color:var(--dim)}
.crumb b{color:var(--txt)}

/* ---------- KHOI CHUNG ---------- */
h1{font-size:clamp(26px,4.2vw,40px);font-weight:900;line-height:1.18;letter-spacing:-.5px;margin:8px 0 14px}
h2{font-size:clamp(20px,2.8vw,27px);font-weight:850;margin:34px 0 14px;letter-spacing:-.2px}
h3{font-size:18px;font-weight:800;margin:22px 0 10px}
p{margin:0 0 13px}
.lead{font-size:17px;color:#c4cedb;margin-bottom:20px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;margin:18px 0;
}
.note{
  background:rgba(240,180,41,.08);border:1px dashed rgba(240,180,41,.42);
  border-radius:12px;padding:14px 18px;margin:18px 0;color:#ffe1a3;
}
.note b{color:#ffd873}
.ok{background:rgba(63,185,80,.08);border-color:rgba(63,185,80,.4);color:#b9f0c4}
.ok b{color:#7ee787}
ul,ol{margin:0 0 14px 22px}
li{margin-bottom:7px}
code{
  background:#1b2430;border:1px solid var(--line);border-radius:6px;
  padding:2px 7px;font-family:Consolas,'Courier New',monospace;font-size:14px;color:var(--gold);
}
.tag{
  display:inline-block;background:#1d2632;border:1px solid var(--line);
  border-radius:999px;padding:4px 12px;font-size:12.5px;color:var(--dim);margin:0 6px 6px 0;
}

/* ---------- BANG ---------- */
.tbwrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;min-width:640px;background:var(--card)}
th,td{padding:13px 15px;text-align:left;border-bottom:1px solid var(--line);font-size:14.5px;vertical-align:top}
th{background:var(--bg2);font-weight:800;font-size:13px;text-transform:uppercase;letter-spacing:.6px;color:var(--dim)}
tr:last-child td{border-bottom:0}
td.y{color:var(--acc);font-weight:800}
td.n{color:#6b7684}
.hl{background:rgba(240,180,41,.06)}

/* ---------- GIA + NUT ---------- */
.price{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin:6px 0 18px}
.price .now{font-size:34px;font-weight:900;color:var(--gold)}
.price .old{font-size:18px;color:var(--dim);text-decoration:line-through}
.price .off{
  background:#da3633;color:#fff;font-size:12.5px;font-weight:800;
  padding:4px 10px;border-radius:999px;
}
.btns{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}
.btn{
  display:inline-flex;align-items:center;gap:9px;cursor:pointer;font-family:inherit;
  border:0;border-radius:12px;padding:14px 26px;font-size:16px;font-weight:850;transition:.16s;
}
.btn:hover{transform:translateY(-2px);filter:brightness(1.08);text-decoration:none}
.btn.buy{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#241a05}
.btn.zalo{background:linear-gradient(135deg,#0068ff,#0053cc);color:#fff}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--txt)}

/* ---------- VIDEO NHUNG ---------- */
.vid{position:relative;padding-top:56.25%;border-radius:var(--radius);overflow:hidden;margin:18px 0;background:#000}
.vid iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.ttbox{max-width:780px;margin:18px auto}

/* ---------- CHAN TRANG ---------- */
footer{
  border-top:1px solid var(--line);margin-top:50px;padding:26px 0 40px;
  color:var(--dim);font-size:14px;text-align:center;
}
footer a{color:var(--blue)}
.fabz{
  position:fixed;right:18px;bottom:18px;z-index:60;
  width:56px;height:56px;border-radius:50%;display:grid;place-items:center;
  background:linear-gradient(135deg,#0068ff,#0053cc);box-shadow:0 10px 26px rgba(0,104,255,.4);
}
.fabz svg{width:28px;height:28px;fill:#fff}
.fabz:hover{transform:scale(1.08)}
@media(max-width:560px){
  .card{padding:17px}
  .btn{padding:12px 20px;font-size:15px}
}